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| Planning track time. Any bets? https://slantsix.org/forum/viewtopic.php?t=26767 |
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| Author: | Bren67Cuda904 [ Mon Jan 21, 2008 1:02 am ] |
| Post subject: | Planning track time. Any bets? |
Planning to hit the 1/4 on Wed. It looks like the weather and temp should be about the same as the last time I went and ran 15.6. This time I am planning to split gears (2.74,2.13,1.54,1.20,1,.78 ) and see how much I gain. Ofcourse I'll go through the traps using the 1.2 ratio (2nd over) I plan to run the GV without opening up the exhaust cutout to see where the gains are coming from. Then opening the exhaust also. Current ET 15.6 Gear spliting. ? (-.4) Exhaust cutout ? (-.3 New ET 14.9 Do you think I'll make it? PS rear gear 3.07:1, 26.1" tire |
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| Author: | Joshie225 [ Mon Jan 21, 2008 7:39 am ] |
| Post subject: | |
If you shift at 6000 RPM you'll go through the traps the top of 2nd gear. I would guess you'll only see a 0.2 sec gain from gear splitting. You really need 3.91s to use 2nd over with the trap speeds you've been running. |
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| Author: | Bren67Cuda904 [ Mon Jan 21, 2008 7:55 am ] |
| Post subject: | |
If I shift at 6000 I'll run slower. The power falls off at 5000. What about open exhaust gains? |
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| Author: | Joshie225 [ Mon Jan 21, 2008 8:28 am ] |
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You only get 5000 RPM out of your engine? I used to shift my Comp 264° (only 224°@ .050") cammed 225 at 5500 RPM. When I had the 4.10s and regular 1:1 4-speed for one race I ran it up to 5800 on the back straight at PIR. I did lose an oil pump gear that race though.  Again, you'll probably only see 1/2 the gains you're predicting (hoping for) from these changes. We can guess all day long so go get some time slips. |
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| Author: | Dart270 [ Tue Jan 22, 2008 5:45 pm ] |
| Post subject: | |
If that cutout is after your Y-pipe, you'll see nothing there. 0.1-0.3 is realistic. Course the air will be better? Lou |
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| Author: | Slant Cecil [ Thu Jan 24, 2008 2:21 pm ] |
| Post subject: | |
+.10 to .00 from splitting the GV -.10 to -.20 from opening the cut-out |
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